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Hello Roger, I would wait to see what the shop says the problem is. After that, I think I would be looking for a refund and find a shop that CAN fix it.
IF the transmission is not electrically controlled (TCM) I have to ask if the valve piston in the valve body was installed the correct way around as it appears that the port openings are out of sync with the selection
The throttle valve cable controls the transmission pressure. Adjusting this cable is the most important step when installing a 700R4 or 200R4 transmission.
it sounds like u have transmission torque converter clutch shudder, I recommened you change the fluid and add 2 ounces of gear oil friction modifier, this works very well at curing this type of shudder issue.
96 gm trucks had a proble with third gear burning out because of a ground issue from pcm..there was a bulletin for adding a new ground for third gear control circuit...aftermarket trans shops do not remember this problem and it is often overlooked..take to local dealership and you should be able to get problem resolved
That is a lot of miles on the tranny. Being a Ford it probably has the E4OD tranny. The E4OD has several clutch packs in side. Sounds as though your direct drive clutch pack has gone out. Also the torque converter has a lock up mechanisim in side which may have given up the ghost . This tranny has improved over the years from the origional version. But, this tranny needs frequent service if towing a heavy trailer. Once the fluid gets burned it needs to be changed immediately or problems will result if you let it go and try to change later. Just to purchase a rebuilt if it is a E4OD will be around $3400.00. If you want to rebuild it the parts cost for just a basic kit will be around $900.00 to do it correctly. There are many hard parts to check for tolerances internally. By hard parts I am referring to sun and planetary gears and what not. I hope this has helped. I have rebuilt many Ford trannys over the years and the E4OD can be problematic at times. The newer versions are more reliable.
This may or may not help, but here goes. Those transmissions tend to have a problem with the valve body seperator plate going bad. what it is, is the plate is a bit too soft and it has these check balls (looks like sling shot balls), that open and close. what might be happeneing, is when the tranny is cold the ball is small enough to let tranny fluid thru, but when it warms up the check ball increases in size, enough to lodge in the plate (since the hole in the plate has been enlarged due to the ball pounding it out), thus not letting tranny fluid enguage the correct upshift solenoid. Every tranny i have opened up has had the plate holes pounded out, and i've seen a few where the ball lodged it self in the hole.
Now i'm not sure if the check balls are for the shifting solenoids or not, but it could be. another thing is that there is a shitch or computer inside the transmission bolted to the valve body. when you take the pan off you can see it (i think you have to remove the filter, but i can't remember). anyway try replacing it first. i would just rebuild it tho. its not too hard, but you just have to be clean, and keep trac of the hundreds of little parts and how they go. there is some guy on ebay selling the rebuild kits, and step-by-step videos on how to rebuild specific trannys. he has one for the safari (all years). thats what i used when i rebuilt my tranny on my 95 safari. good luck
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